A system conatins +1C .+2C.-3C.+4C and -5C .The net charge on the system is

A system receives heat continuously at the rate of 10 W. The temperature of the system becomes constant at 70^@C when the temperature of the surroundings is 30^@C . After the heater is switched off, the system cools from 50^@C to 49.9^@C in 1 min. The heat capacity of the system is

Condensers with capacities C, 2 C, 3C and 4C are charged to the voltage, V, 2 V, 3 V and 4 V correspondingly. The circuit is closed. Find the voltage on all condensers in the equilibrium.

Four charges 2C, – 3C, –4C and 5C respectively are placed at all the corners of a square. Which of the following statements is true for the point of intersection of the diagonals?

STATEMENT-1 : The total momentum of a system in C -frame is always zero. and STATEMENT-2 : The total kinetic energy of a system in C -frame is always zero.

The force between two charges 4C and -2C which are separated by a distance of 3km is

A charge Q_(1)=+1" C " and Q_(2)=-4 C are fixed at a separation of 1 m. Where should you place the third charge 'q', so that the entire system is in equilibrium ?

If atimesb=c, btimesc=a, ctimesa=b . If vectors a, b and c are forming a right handed system, then the volume of tetrahedron formed by vectors 3a-2b+2c, -a-2c and 2a-3b+4c is

Three charges q_1 = 1 mu C, q_2 = -2 mu C, and q_3 = -1 mu C are placed at A (0,0,0), B(-1 , 2,3,) and C (2 , -1, 1) . Find the potential of the system of three charges at P( 1, - 2, -1) .

Two charges +5mu C and +10 mu C are placed 20 cm apart. The net electric field at the mid-point between the two charges is

A network of four capacitors of capacity equal to C_(1) = C, C_(2) = 2C, C_(3) = 3C and C_(4) = 4C are connected to a battery as shown in the figure. The ratio of the charges on C_(2) an C_(4) is